Multiple bit toolholder



Aug. 14, 1945. K. P. SCHOEPPNER MULTIPLE BIT TOOL HOLDER Filed Dec 7, 1942 Patented Aug. 14, 1945 UNITED PATENT OFFICE. j 1

I a I '2,'3s2,10s I MULTIPLE BIT TO OLHOLD ER iri Schoeppner, Milwaukee, Wis. I Application December 7, 194;; Serial No. 468,090 Jennie. (01.29%48) This invention'relates to tool holders for use upon machine tools, for example lathes, iiigwhich a bit is held against a workpiece, which has a movement relative'to'the bit, and it consists of an improvement in tool holders heretofore employed for this purpose in which'a' plurality of bits ground for specialized purpos'esfsuch as roughing; finishing, cutting off and threading are so mounted in said tool holder that any one.of them may be brought into working position by a' simple I tool holder which will facilitate repetitive manufacture and thus aid in producing a greater uniformity in a series of identical pieces.

The above and other advantages and objects of this invention will be apparent from the description which follows, in which there is set forth by way of illustration and not of limitation, and with the aid of the accompanying drawing which forms a part hereof, one specific instance of an embodiment of this invention.

In the drawing:

Fig. 1 is a plan View showing the tool holder of this invention mounted upon the slide rest of a lathe in engagement with a work piece shown in fragmentary form;

Fig. 2 is an enlarged detail plan view partly in section of the tool holder shown in Fig. 1;

Fig. 3 is a fragmentary view in elevation and in section of the workin end of the tool holder shown in Fig. 2 viewed through the plane 3- -3 indicated in Fig. 2;

Fig. 4 is a View in end elevation of the tool holder shown in Fig. 2;

Fig. 5 is a view in end elevation and in section viewed through the plane 5-5 indicated in Fig. 2; and

Fig. 6 is a view in end elevation and in section of the tool holder shown in Fig. 2 viewed through the plane 66 indicated in Fig. 2.

Referring now to the drawing and particularly to Fig. 1, the tool holder of this invention is designated generally by the numeral I, the same being shown mounted upon the tool post holder 2 of the cutting feed portion 3 of a conventional shown in fragmentary form} A simple tool post clamp 6 serves tohold the tool holder I securely inlplace.

The tool holder I shown in greater detail in the remaining figures is made up of a body portion I of elongated generally conical shape having flattened upper and lower" surfaces 8 and 9. The body I contains a longitudinal'central borefor accommodating a clamping shank 1 I0. The clamping shank I0 is threaded at its-right hand end as seen in Fig. 2 and is integrally attached to I body I and carries in threaded engagement compound slide rest 4 carried upon lathe ways 5 55 therewith a hand clamping nut I4 by which the boss I2 may be drawn into the socket I3, thus holding the bit mounting I I immovable with respect to thebody I in any one of four selected positions angularly displaced from one another by 90. Secured to the end of the shank I0 is,a cap I5, which when the end nut I4 is backed away can be tapped lightly to dislodge the boss I2 from the socket I3 when it is desired to change the position of the bit mounting II.

As shown more clearly in Fig. 4 the bit mounting I I is provided with four bit clamping jaws I6 disposed at right angles toone another, arranged to accommodate an assortment of cutting bits I1 held in place by clamping screws I8. As more clearly appears in Figs. 2 and 3 the seats of the clamping jaws I6 are inclined with respect to the axis of the shank I I]. The purpose of this inclination appears from aconsideration of Fig. 1, in which the mounting relationship of the tool holder to a work piece I9 appears. In this way a single bit I 'I-may be brought into working contact with the work while the remaining bits I1 are in a position which clears the work. In order to obtain this relationship the body I of the tool holder I is secured upon the slide rest 4 in a position inclined with respect to the axis of the work piece by an amount substantially equal to the inclination of the seats in the bit holder II. To facilitate the obtaining of the: proper positioning of the body I, the flattened faces 8 and 9 terminate in inclined ledges 20 and 2| which can be brought into engagement with the tool post clamp 6.

In operation in a typical instance, the tool holder of this invention furnished with an assortment of bits as shown in the several figures of the drawing may be mounted as shown in Fig. 1. Assuming that the operationto b performed comprises the reduction of a rough piece into the form of a finished shaft with a threaded end, the tool holder is adjusted to first bring the roughing bit into working position as shown in Fig. 1. As the work progresses and the several operations required are successively performed,

the end clamping nut I4 is released and the bit mountingv H is rotated to bring the desired tool into position. Thisop'eration is extremely simple and avoids the necessity for replacing the tool holder each time a different shaped bit is mounting, and bit securing means forming a part of said adjustable bit mounting adapted to secure bits thereto to form therewith a rigidly associated assembly of bits and bit mounting capable of adjustable movement with respect to said body portion without relative movement between said bits and said bit mounting said bit securing means being disposed so as to hold bits in positions corresponding to the positions of adjustment of said bitrmounting with respect -to-said body. I '2; Ina multiple bit tool holder, the combination comprising a body portion adapted for mounting upon a tool post said body portion being prorequired. I There is thus a considerable saving in the amount of material employed in'thenecessar-y has been made and several identical pieces'areto be produced, the proper alignment ofthe several tools required remains set and the operators time normally involved in insuring proper align ment OftQQ-IsissaVed.

Thatlwhic'h I claim as my invention is:

1. In a multiple bit tool holder, the combination comprising a body. portion adapted for mounting upon .a tool post -said--body:-portion being provided with parallel upperandlower flat faces terminating .in transverse oblique positioning ledgessaid body being provided with a longi- "l5 assortment of tools. Furthermore, once a set up tudinal bore-terminating in -a polygonal socket-at one end'ofsaidbodman adjustable bit mounting havinga shank disposed within said bor and havingj'a polygonal boss oi shape and size complementary to-said socket receivable therein for locating said mounting in aapluralityof predetermined :angularly-rspaced positions with respect vided with parallel upper and lower fiat faces terminating in transverseoblique positioning ledges, said body being provided with a longitudinal bore terminating in a polygonal socket 'at one end ofsaidbody, an adjustable bit mounting having a shank disposed within said bore and having a polygonal boss of shape: and size complementary -.to -said --socket receivable therein for locating said mounting in a 'pluralityof :predetermined-*angularly spaced :positions, and -.means forming-"apart of said mountingsfor securing bits mounting with respect to said body.

- 35 to said body, a nuton saidshank for locking'said "KARL'PQSCHOEPPNER. 

